Dart SDK roll for 2019-01-09

50ea6344f5 Use TypeEnvironment.getTypeAsInstanceOf instead of ClassHierarchy
d21b852b02 Extend bare to have coverage across all AOT configurations
a7b23e1cb5 [Kernel] Add text serializers for some invocations
e7c808f910 Remove unused methods
cc4da96fb5 Decouple runtime type analysis from the K-world
3c662736d9 [VM] Ensure PP is restored when returning from runtime calls in bare instructions mode.

DEPS

@@ -31,7 +31,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'd09c1265e9bf86369ede45c13bba10496d89c613',
+  'dart_revision': '50ea6344f5a85493b57df086bd70b686ca2baaf6',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: 4e6eee6b08ccf3676b904cb20ba71de1
+Signature: be59c80b519075b45fcd4716be07f4c4
 
 UNUSED LICENSES: